dm: core: Add function to get child count of ofnode or device

This patch add function used to get the child count of
a ofnode or a device

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Reviewed-by: Weijie Gao <weijie.gao@mediatek.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c
index 20871a681552f65ad2df2bdda438ae3471e04e61..e3c42dae5c6e221df7ea96102e87e01e07f74963 100644 (file)
--- a/drivers/core/ofnode.c
+++ b/drivers/core/ofnode.c
@@ -474,6 +474,17 @@ ofnode ofnode_get_chosen_node(const char *name)
        return ofnode_path(prop);
 }
 
+int ofnode_get_child_count(ofnode parent)
+{
+       ofnode child;
+       int num = 0;
+
+       ofnode_for_each_subnode(child, parent)
+               num++;
+
+       return num;
+}
+
 static int decode_timing_property(ofnode node, const char *name,
                                  struct timing_entry *result)
 {

diff --git a/drivers/core/read.c b/drivers/core/read.c
index 47b8e034465ac0f648754d2a4ba1f15e03e54f57..3d421f7a69c71472abed7c0dd60de1b8c9a1c05e 100644 (file)
--- a/drivers/core/read.c
+++ b/drivers/core/read.c
@@ -352,3 +352,8 @@ fdt_addr_t dev_read_addr_pci(const struct udevice *dev)
 
        return addr;
 }
+
+int dev_get_child_count(const struct udevice *dev)
+{
+       return ofnode_get_child_count(dev_ofnode(dev));
+}

diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h
index 618fc10390e8407ec26792b87423b90e48dc8244..a0d3df77868434e7ae17df8a72ff5eee456a13fc 100644 (file)
--- a/include/dm/ofnode.h
+++ b/include/dm/ofnode.h
@@ -879,6 +879,14 @@ ofnode ofnode_by_prop_value(ofnode from, const char *propname,
             ofnode_valid(node); \
             node = ofnode_next_subnode(node))
 
+/**
+ * ofnode_get_child_count() - get the child count of a ofnode
+ *
+ * @node: valid node to get its child count
+ * @return the number of subnodes
+ */
+int ofnode_get_child_count(ofnode parent);
+
 /**
  * ofnode_translate_address() - Translate a device-tree address
  *

diff --git a/include/dm/read.h b/include/dm/read.h
index 03c15b85506b6d31c636d097ba0ea2c253442b18..b952551d5552dc04e097c230f5a42cb8a723e932 100644 (file)
--- a/include/dm/read.h
+++ b/include/dm/read.h
@@ -669,6 +669,14 @@ u64 dev_translate_dma_address(const struct udevice *dev,
  */
 int dev_read_alias_highest_id(const char *stem);
 
+/**
+ * dev_get_child_count() - get the child count of a device
+ *
+ * @dev: device to use for interation (struct udevice *)
+ * @return the count of child subnode
+ */
+int dev_get_child_count(const struct udevice *dev);
+
 #else /* CONFIG_DM_DEV_READ_INLINE is enabled */
 
 static inline int dev_read_u32(const struct udevice *dev,
@@ -978,6 +986,11 @@ static inline int dev_read_alias_highest_id(const char *stem)
        return fdtdec_get_alias_highest_id(gd->fdt_blob, stem);
 }
 
+static inline int dev_get_child_count(const struct udevice *dev)
+{
+       return ofnode_get_child_count(dev_ofnode(dev));
+}
+
 #endif /* CONFIG_DM_DEV_READ_INLINE */
 
 /**